@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Mono:wght@500;600;700&display=swap');

:root {
  --ink: #0B0D10;
  --ink-raised: #14171C;
  --ink-line: #262B33;
  --paper: #F2F4F6;
  --paper-dim: #8A93A0;
  --go: #21E37A;
  --go-dim: #12281C;
  --wait: #FFB020;
  --wait-dim: #2B2413;
  --gate: #3D8BFF;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

button {
  font-family: inherit;
}

/* Subtle timing-gate texture: faint concentric ticks behind the content,
   evoking a starting-line / stopwatch bezel without decorating for its own sake. */
.gate-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(circle at 50% 18%, rgba(61,139,255,0.10), transparent 45%),
    repeating-radial-gradient(circle at 50% 18%, rgba(255,255,255,0.025) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.screen {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ---------- Onboarding ---------- */
.onboard {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  gap: 28px;
  text-align: center;
}

.onboard .mark {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--gate);
}

.onboard h1 {
  font-size: clamp(28px, 8vw, 40px);
  font-weight: 700;
  margin: 0;
  line-height: 1.15;
}

.onboard p.sub {
  color: var(--paper-dim);
  margin: 0;
  font-size: 15px;
  max-width: 32ch;
}

.name-form {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.name-form input {
  width: 100%;
  padding: 18px 16px;
  font-size: 18px;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--paper);
  background: var(--ink-raised);
  border: 1px solid var(--ink-line);
  border-radius: 12px;
  outline: none;
}

.name-form input:focus {
  border-color: var(--gate);
}

.name-form input::placeholder {
  color: var(--paper-dim);
  font-weight: 500;
}

.name-form button {
  padding: 18px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  background: var(--go);
  border: none;
  border-radius: 12px;
  cursor: pointer;
}

.name-form button:disabled {
  background: var(--ink-line);
  color: var(--paper-dim);
}

/* ---------- Buzzer ---------- */
.buzzer-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.buzzer-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
}

.buzzer-topbar .who {
  font-size: 14px;
  color: var(--paper-dim);
}

.buzzer-topbar .who strong {
  color: var(--paper);
  font-weight: 600;
}

.status-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--ink-line);
  color: var(--paper-dim);
}

.status-pill[data-state="armed"] {
  color: var(--go);
  border-color: var(--go);
}

.status-pill[data-state="waiting"] {
  color: var(--wait);
  border-color: var(--wait);
}

.buzz-wrap {
  flex: 1;
  display: flex;
  padding: 16px;
  padding-bottom: max(16px, env(safe-area-inset-bottom));
}

.buzz-btn {
  flex: 1;
  width: 100%;
  border: none;
  border-radius: 28px;
  font-family: var(--font-display);
  font-weight: 700;
  cursor: pointer;
  transition: transform 80ms ease, background-color 120ms ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.buzz-btn:active {
  transform: scale(0.98);
}

.buzz-btn .label {
  font-size: clamp(30px, 11vw, 54px);
  letter-spacing: 0.01em;
}

.buzz-btn .hint {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  opacity: 0.85;
}

.buzz-btn[data-state="waiting"] {
  background: var(--ink-raised);
  color: var(--wait);
  border: 2px solid var(--wait-dim);
}

.buzz-btn[data-state="armed"] {
  background: var(--go);
  color: #06170F;
}

.buzz-btn[data-state="pressed"] {
  background: var(--ink-raised);
  color: var(--paper);
  border: 2px solid var(--go);
}

.buzz-btn[data-state="armed"]:hover {
  background: #2BFB8E;
}

.buzz-btn .rank {
  font-family: var(--font-mono);
  font-size: clamp(56px, 20vw, 96px);
  font-weight: 700;
  color: var(--go);
  line-height: 1;
}

.buzz-btn .delta {
  font-family: var(--font-mono);
  color: var(--paper-dim);
  font-size: 16px;
}

/* ---------- Host ---------- */
.host-screen {
  min-height: 100dvh;
  padding: 28px 20px 60px;
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.host-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 22px;
  flex-wrap: wrap;
  gap: 10px;
}

.host-header .mark {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gate);
  letter-spacing: 0.02em;
}

.host-header h1 {
  font-size: 24px;
  margin: 4px 0 0;
  font-weight: 700;
}

.presence {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}

.presence .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--go);
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

.ctrl-btn {
  padding: 18px 14px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid var(--ink-line);
  background: var(--ink-raised);
  color: var(--paper);
}

.ctrl-btn.start {
  background: var(--go);
  color: #06170F;
  border-color: var(--go);
}

.ctrl-btn.start[disabled] {
  background: var(--ink-raised);
  color: var(--paper-dim);
  border-color: var(--ink-line);
  cursor: default;
}

.ctrl-btn.reset {
  color: var(--wait);
}

.round-state {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-dim);
  margin: -16px 0 22px;
}

.round-state[data-state="armed"] {
  color: var(--go);
}

.board {
  border-top: 1px solid var(--ink-line);
}

.board-empty {
  padding: 48px 4px;
  text-align: center;
  color: var(--paper-dim);
  font-size: 14px;
}

.board-row {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--ink-line);
}

.board-row .rank {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-dim);
}

.board-row:first-child .rank {
  color: var(--go);
}

.board-row .name {
  font-size: 17px;
  font-weight: 600;
}

.board-row .delta {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--gate);
  font-weight: 600;
}

.board-row:first-child .delta {
  color: var(--go);
}

@media (min-width: 640px) {
  .controls { grid-template-columns: 1fr 1fr; max-width: 380px; }
}